Weak material (4)
But I've got no explanation for this one! Could you help me understand?
(Other definitions for lama that I've seen before include "A Buddhist priest in Tibet (4)" , "Dalai . . . ., chief priest and once ruler of Tibet" , "Holy man in Tibet" , "Religious leader" , "A Tibetan Buddhist priest or monk" .)
I believe this clue is a double definition.
'weak' is the first definition.
('lame' can be similar in meaning to 'weak')
'material' is the second definition.
(lame is a kind of material)
(Other definitions for lame that I've seen before include "Disabled in leg or foot" , "Fabric interwoven with metal threads" , "Flimsy, as an excuse" , "Imperfect - material" , "Disabled in the feet or legs" .)